Quartz Achromatic Quarter-Wave Plate AWP20Q-T4Q
Quarter-wave plates commonly convert linear and circular polarization into each other to control source polarization. Unlike standard plates, achromatic plates provide stable phase retardance over a broad wavelength band, unaffected by incident wavelength. JCOPTIX achromatic quarter-wave plates combine birefringent quartz and magnesium fluoride crystals with an air gap. The quartz fast axis aligns with the magnesium-fluoride slow axis, balancing and canceling relative retardance shifts across the band to leave a net quarter-wave retardance. Efficient broadband AR coatings on every surface ensure excellent transmitted wavefront quality and minimize beam deviation and reflection losses. Flat response particularly suits tunable lasers, multiline lasers, and broadband sources. The air gap raises the damage threshold for high-power use. JCOPTIX plates with 10 mm and 20 mm clear apertures have standard SM05 or SM1 external threads; 45 mm clear-aperture plates mount in externally threaded SM2 tubes. These fit matching internally threaded rotation mounts such as MMR-05T, MMR-1T, and MMR-2T. JCOPTIX's proprietary rubber washer at the external-thread base facilitates direct alignment to specific mount angles. Operation is simple and quick: 1. Screw the achromatic plate into the rotation mount until the SM05/SM1 thread reaches its end; lock the rotating part as needed. 2. Check the angular difference between the fast-axis direction (white housing line) and the target scale mark (0° or 90°). 3. Apply slight force to continue turning the protruding cylindrical part until the white fast-axis line aligns with the target mark. Adjustment is approximately 60°. JCOPTIX offers mounted achromatic plates with diameters of 10 mm and 20 mm, covering 400-700nm, 700-1100nm, and 1100-1650nm. Contact technical support for custom sizes, coatings, or bands.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Optical element material | Quartz Crystal & MgF₂ |
| Crystal Diameter | 22.5 mm |
| Clear Aperture Dimension | 20.0 mm |
| Operating Wavelength | 1100-1650 nm |
| Retardance | λ/4 |
| Retardance accuracy | ± λ/100 |
| Transmitted wavefront error [@633 nm] | λ/8 |
| Coating R_avg [1100-1650 nm (6° AOI, Single Side)] | R_avg<0.5% @1100-1650 nm (6° AOI, Single Side) |
| Damage Threshold [5 J/cm² at 1542 nm, 10 ns, 10 Hz, Ø0.189 mm] | 5 J/cm² (1542 nm, 10 ns, 10 Hz, Ø0.189 mm) |
| Surface parallelism | < 10 arcsec |
| Surface quality (scratch/dig) | 40/20 |
Key Features
Datasheet
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Supplier Information
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